Examine the values of __amrc__code__feedback__rc and __amrc__code__feedback__fdbk immediately after receiving this errno. Look up the __rc and __fdbk values in a VSAM Macro Reference manual, such as MVS/ESA VSAM Administration: Macro Instruction Reference. __rc corresponds to the register 15 value, __fdbk corresponds to the Reason Code. See z/OS XL C/C++ Programming Guide for more information on the __amrc structure.